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A168428 a(n) = 4^n mod 10. 1
1, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..93.

Index entries for linear recurrences with constant coefficients, signature (0, 1).

FORMULA

a(n) = A010879(A000302(n)). - Michel Marcus, Jul 23 2016

MATHEMATICA

PowerMod[4, Range[0, 25], 10] (* G. C. Greubel, Jul 22 2016 *)

PROG

(Sage) [power_mod(4, n, 10)for n in xrange(0, 94)] #

(PARI) a(n)=lift(Mod(4, 10)^n) \\ Charles R Greathouse IV, Mar 22 2016

(MAGMA) [Modexp(4, n, 10): n in [0..100]]; // Vincenzo Librandi, Jul 23 2016

CROSSREFS

Cf. A000302, A010879.

Sequence in context: A199865 A196818 A010711 * A127018 A083396 A142973

Adjacent sequences:  A168425 A168426 A168427 * A168429 A168430 A168431

KEYWORD

nonn,easy

AUTHOR

Zerinvary Lajos, Nov 25 2009

STATUS

approved

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Last modified July 16 23:49 EDT 2019. Contains 325092 sequences. (Running on oeis4.)